Here's yet another version of the malloc routines: k_malloc/k_mfree in http://www.tu-chemnitz.de/informatik/osg/lehre/vorl_BS.SRC/malloc.c I wonder where these routines were 'borrowed' from? The code appears to be intermediate between 32V and SVR4, containing assertions and using mapstart/mapsize, but without spl calls. -- Roger